Checker searches for SMARTS defined substructures. Substructure Checkers can be set individually.
Fixer: when the substructure is specified as reaction SMARTS or SMIRKS, the checker works as fixer as well.
|Checker setting : SMARTS: O=N=O>>[O-][N+]=O||substructure_nitro||substructure_fixed|
Note : You can rename "substructure checker" in Structure Checker GUI. Click on the name field of the configured checker and rename it by typing a new name. For example, you can name it as Nitro Checker.